public class Calculate_the_value_of_the_score {
    public static void main(String[] args) {
        double sum = 0;
        int flag = 1;
        for (int i = 1; i <= 100; i++) {
                sum += 1.0/ i * flag;
                flag = -flag;
            }
        System.out.println(sum);
    }
}
